“…In the northern region, radon concentration levels have been measured at nine locations (cities or towns): Soum region (Abumurad, 2005), Irbid city (Al-Kofahi, 1992), Malka town (Al-Zubaidy, 2012b), Hakama town (Al-Zubaidy, 2012a), Ajloun city , Ajloun district (Al-Khateeb, 2012), Jerash city including the historical part (Alzoubi, 2013), Jerash city and the northern part of the Jordan Valley (Kullab, 2005). In this region, the minimum indoors, measured mean value of radon concentration levels in air was 16.21 Bq.m Measurements in the middle region of Jordan have been performed at the following locations: As-Salt suburbs (Ya'qoub, 2009), As-Salt city , Mafraq city (Al-Zubaidy, 2012), Amman , Zarka city (Kullab, 2005) (Elzain, 2011), Al-Ruseifa (Kullab, 2005) (Kullab, 2001), Madaba city and Dead Sea (Al-Taj, 2004) (Al-Bataina, 2005 (Akawwi, 2014). In this part, the minimum mean value for radon concentration in air was measured to be 27.25 in Zarka city, and the maximum was 386 Bq.m We grouped a number of locations into the southern region, and found that measurements have taken at the following locations: Karak city , Tafila city and suburbs Abu-Haija, 2010;(Salameh, 2011), Ma'an city , and Aqaba city .…”